bug#54919: Guix hangs near the end of ‘home’ operations

[Brian Cully]

        During ‘home reconfigure’ after it says ‘Finished updating symlinks.’,
guix hangs forever. Attempting to interrupt with ^C failed, and I had to
force-close my ssh session.

        Logging back in, ‘home list-generations’ claims to have
installed a new generation and moved forward. I no longer knew the state
of this generation, since I had to forcefully quit the previous
operation, so I felt it safest to try to roll back my home.

        Again, ‘home roll-back’ got to ‘Finished updating symlinks’ and
hard hung. I probably don’t need to tell anyone how this makes me feel
about the stability of this system or any guarantees of atomicity in
transactions.

-bjc